.main-content-div{
    width: 96.5%;
    margin: 0 auto 10px;
    background-color: rgb(168, 168, 168, 0.2);
    border-radius: 5px;
    padding-bottom: 50px;
    overflow: hidden;
}

.form-div{
    width: 60%;
    height: 750px;
    margin: 0 auto;
    padding: 20px 40px 40px;
    background-color: white;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    margin-top: 50px;
}

.form-div h4{
    text-align: center;
}

.form-div .row.mb-3{
    width: 60%;
    margin-left:15%;
    margin-top: 25px;
}

.tips{
    text-align: center;
    color: red;
}

.col-form-label{
    text-align: right;
}

.form-select{
    text-align: center;
}

.btn.btn-primary{
    width: 30%;
    margin: 20px 0 0 35%;
}